Synergistic effects of coffee aromatherapy and oxytocin massage on serum prolactin levels in postpartum mothers: A quasi-experimental study - Rizki Fitrianingtyas; Yuningsih; Trisna Pangestuning Tyas; Yolanda Indri Octaviani; Dinar Perbawati; Fitri Kusumasari; Dini Eka Pripuspitasari (Nursing and Health Sciences Journal (NHSJ), 2026)